Machine for making burners



Dec. 3, 1935. c pw c 2,022,857

MACHINE FOR MAKING BURNERS Original Filed Jan. 2, 1935 I5 Sheets-Sheet l -INVENTOR BY WWW ATTQRNEY8 Dec. 3, 1935.

C. L. HARDWICK MACHINE FOR MAKING BURNERS Original Filed Jan. 2, 1935 3 Sheets-Sheet 5 INVENTOR ATTORN EYS Patented Dec. 3, 1935 UNITED STATES PATENT OFFEQE Original application January 2, 1935, Serial No. 172. Divided and this application June 6, 1935,

Serial No. 25,297

10 Claims.

This invention relates to an apparatus for making round cast burners for gas ranges, and has for an object the provision of a new and improved device of this character.

This application is a division of my co-pending application for Method of. making round burners filed January 2, 1935, Serial No. 172.

In the drawings accompanying this specification and forming a part of this application:

Figure 1 is a side elevation partly in section of the apparatus;

Figure 2 is a bottom view of the cutter head with the cutters shown in outer position;

Figure 3 is a vertical sectional view of the apparatus, the cutters being shown in inner position;

Figure 4 is a bottom view of the cutter head with the cutters in inner position;

Figure 5 is a plan view of the cutter actuating mechanism;

Figure 6 is a vertical sectional view through one of the stationary cutters showing the first operation upon the burner;

Figure 7 is a bottom plan view of Figure 6;

Figure 8 is a vertical sectional view through one of the movable cutters showing the position assumed in forming the burner slot and overhang; and

Figure 9 is a bottom plan view of Figure 8.

Referring more particularly to the drawings 1 denotes a drill press table, and 12 a cast gas burner adapted to be held in stationary position on the table l, by means of a suitable holder 3. My improved apparatus 4 comprises a vertically disposed bored shaft 5, to the lower end of which a cutter head 6 is suitably fixed, the upper end of the shaft being formed with a tapered shank portion 1, adapted to be inserted in and rotated by a chuck 8, forming part of the drill press, not shown.

The cutter head 6 comprises a circular top plate 9, to the bottom face of which a plurality of spaced guide segments it are secured by screws H. These parts 9 and it are also additionally secured together by means of headed studs or bolts 12, one for each segment, the shank M of which passes through the top plate and segment, and thence through a cutter I3, a nut I4 on the threaded end of the shank being employed to tightly clamp the cutter to the bottom face of the segment. A screw key 55, serves to hold the stud l2 from becoming accidently misplaced when the cutter is removed. The cutter head is secured to the shaft or spindle 5, by means of. a reaming tool IS, the upper tapered end of which has a driving fit within the bore of the shaft. A collar l1 pinned to the shaft 5 above the plate 6, and a nut l8 threaded on the lower reduced end of the shaft 5, serve to removably clamp the parts in place. The lower end of the reamer I6 is tapered and formed with a plurality of fiutes to provide 6 cutting edges l9.

Slidably mounted for radial movement between adjacent segments Ill are four plates 25, having beveled side edges 2|, engaging with the reversely beveled or under-cut side edges 22, of the segi0 ments. These sliding plates carry depending studs 23 upon which upper and lower disc-shaped cutters 24 and 25 respectively are fixedly mounted. Collars 26, one for each stud 23, space the upper cutters'24 from the plate 26, while nuts 21 clamp the two cutters tightly upon the studs. It will be noted that the upper cutters 24 are of greater diameter than the lower cutters 25, for a purpose hereinafter described.

Adjustment of the sliding plates 25 and the 20 cutters carried thereby is effected through the medium of a plurality of arms 28, having a horizontally disposed portion extending into radial slots 29, in top plate 9, and engaging the top face of the sliding plates, bolts 30 being employed 25- to secure the arms to the plate. The inner ends of the arms 28 are formed with upwardly and inwardly inclined extensions 3! which project into upwardly and inwardly inclined slots 32, formed in a cone shaped cam member 33, preferably in 30 the form of a casting. The extremity of each extension 3| carries a roller 34, of approximately the same diameter as that of the slots 32. When the casting 33 is lowered from Figure 1 position to Figure 3 position the outer wall or cam face 35 35 of the slots 32 will act upon the rollers 34, to force the plates and their cutters inwardly and when the casting is moved upwardly from Figure 3 to Figure 1 position, the inner wall or cam face 36 of the slots will force the plates outwardly.

Upward and downward movement of the cam member 33 is effected by means of a hand wheel 31 and toggle arms 35, four in number. Thus the cam member 33 is formed with a central bore 39 which receives the shaft or spindle 5 for relative 45 vertical movement. A hollow threaded extension 45 integrally formed on the upper end of the cam member and having its bore coaxial with the bore 39, projects upwardly through an apertured plate 4!, and is fixed thereto by a flange 52 suit- 50 ably secured to the extension. The bottom face of the plate M and the fiat top face of the cam member 33 are formed with complemental grooves to provide a race for ball bearings M which per mit of the plate M being easily rotated relatively 55.

' plates 4! and 43.

to the extension 4a. A second apertured plate 43, similar to but smaller than the plate ll is rotatably seated above the plate 4!, upon a collar or enlargement t5, fixed to or forming a part of the shaft 5, and is held against upward vertical movement by a collar 41% threaded upon the shaft. The collar 46 is spaced from the plate 63, similar to the spacing of the plate ll from the top of the vertically movable cam member 33, and the opposed faces of the collar t5 and the plate 53 are formed with a race for ball bearings 48.

The inner ends of the links 49 of each of the four toggle arms 38, previously referred to, are pivotally connected together by pivot pins 5i, and the outer ends of the respective links are pivoted to the plates 4| and 63. Thus pivot pins 5! connect the outer ends of the lower links to vertically disposed flanges 52 extending from end to end of the plate t 5, adjacent the side edges thereof, and the outer ends of the upper links of each toggle arm are pivotally connected to studs 53 projecting laterally from the four corners of the plate 43.

An adjusting screw 54, having a hand wheel 55 fixed to its outer end passes operatively through threaded axially aligned bores 55% and El respectively formed in spaced blocks 58 and 59, for actuating the toggle arms The block 58 is formed with oppositely disposed arms 50, pivotally connected at their inner or free ends to the pivot pins 50, connecting the inner ends of the links 49 of the toggle arms at one end of the plates 4! and 43, while the block 58, is provided with arms 6!, which are pivotally connected at their free ends to those pivot pins 5% of the corresponding toggle arms connected to the opposite ends of The screw threads on that portion of the adjusting screw 54, which actuates the block 58 have a left hand pitch, whereas the portion of the screw which actuates the block 59 has a right hand pitch, to speed up the action of the screw.

A pair of elongated parallel fingers 62 and 63 fixed to and projecting respectively from the plates 4! and 43, are adapted to engage a post 64 secured to the table I, and prevent the toggle adjusting mechanism from rotating about the axis of the shaft The operation of the device is as follows: The burner 2, to be operated upon, and which is cast in the general form illustrated in Figure 1 is placed in the holder 3, where it is securely clamped, in centered position with respect to the longitudinal axis of the reamer part Hi of the tool, by any suitable means not shown. The operator then lowers the rotating chuck 8 and the apparatus carried thereby, with one hand, and guides the reamer into the axial through bore 65 of burner, The rough places in the bore, formed in. casting, are thus removed and the bore otherwise trued. At the same time the cutters l 3 fixed to the rapidly rotating cutter head 6, machine a perfectly true peripheral portion 65 adjacent the top of the round burner head 2'. During this initial operation, the adjustable cutters 24 and 25, fixed to sliding plates Ell, remain in Figure 1 or outermost position. However, as the operation of forming the vertically disposed peripheral surface 56 is completed, the operator rotates the hand wheel in a clockwise direction thus causing the blocks 53 and 59 to move in opposing directions. As the blocks separate, the lower ends of the links 49 of each toggle 38 will be forced downwardly, thus communicating similar movement to the plate 4|, which carries the cam 33. Conse-v quently the cam will also be moved downwardly and the sliding plates 20 inwardly in an obvious manner against the expansive action of coil springs 67. As the plates 20 move inwardly the relatively thin cutters 24, which are of greater diameter than the cutters 25, will form a horizontally disposed ring shaped slot 68 in the previously formed surface 66 of the burner. Rotation of the wheel 31 is then continued until the cutters 25, which are of considerable width or thickness engage that portion of the peripheral surface 86, directly beneath the previously formed slot and undercut the same as at 69, to produce an overhanging portion 10 directly above the slot. The slot 68 constitutes the flame orifice of the burner and the overhanging portion or lip lil forms a guard for. the flame orifice to protect it from becoming clogged by grease or food spilled from a cooking utensil, not shown. Owing to the fact that the cutter 24 is superposed on the cut- A the coacting portions H and 12, which form a i right angle at the top outer extremity of the undercut area 69.

Having thus described my invention, what I claim is:

1. An apparatus for making round gas burners comprising a cutter head, a shaft fixed to said cutter head, a fixed cutter support and a radially movable cutter support symmetrically arranged about said shaft, a cutter on the fixed support, a pair of cutters on the movable support, one of said cutters overlapping the other cutter and being of less thickness than said other cutter, means for rotating said shaft and means for actuating said radially movable cutter supports.

2. An apparatus for making round gas burners as described in claim 1, wherein the radially movable cutter supports are mounted on sliding plates and the means for actuating the radially movable cutter supports, include a cam member having inclined slots in which inclined extensions on the sliding plates engage.

3. An apparatus for making round gas burners as described in claim 1, wherein the adjustable cutters are superimposed and the cutting edge of the uppermost cutter overlaps the cutting edge of the other of said cutters.

4. An apparatus for making round gas bumers having axial bores comprising a burner support, a cutter head, a shaft extending through and fixed to said cutter head, a reamer on the shaft adapted to enter and ream the axial bore of the burner and clamp the burner to the burner support while said shaft is being rotated, a plurality of cutter supports symmetrically arranged about and spaced from the shaft, some of said supports being fixed to the cutter head and others radially movable thereon, a cutter on each of the fixed supports, a first cutter on each movable support, and a second cutter superimposed on each of said first cutters, said second cutters overlapping and being of less thickness than said first cutters and means for rotating said shaft.

5. An apparatus for making round gas bumers having axial bores comprising a burner support, a cutter head, a shaft extending through and fixed to said cutter head, a reamer on the shaft adapted to enter and ream the axial bore of the burner and clamp the burner to the burner support while said shaft is being rotated, a plurality of cutter supports symmetrically arranged about and spaced from the shaft, some of said supports being fixed to the cutter head and others radially movable thereon, a cutter on each of the fixed supports, a first cutter on each movable support, and a second cutter superimposed on each of said first cutters, said second cutters overlapping and being of less thickness than said first cutters and means for rotating said shaft and means for actuating said radially movable cutter supports.

6. An apparatus for making round gas burners having an axial through passage comprising a cutter head, a shaft fixed to said cutter head, a reamer extension on said shaft for truing the axial through passage of the burner, fixed cutter supports and movable cutter supports alternately and symmetrically arranged on said cutter head about said shaft, a cutter of substantial depth on each of said fixed supports, a pair of superimposed cutters on each of said movable supports, the topmost of said last mentioned cutters being thin and the bottommost cutters being of substantial thickness, means for rotating said shaft, means for actuating the movable supports, and means for supporting the burner with its through passage in axial alinement with the reamer.

'7. An apparatus for making round gas burners comprising a burner support, a cutter head, a shaft fixed to said cutter head, means for rotating said shaft, a plurality of fixed cutter supports and cutters therefor symmetrically mounted on said cutter head about said shaft, radially movable plates having upwardly and inwardly inclined extensions mounted on said cutter head, a plurality of cutters on each of said radially movable plates, a cam member slidable on said shaft having inclined slots into which said extensions extend and lock said cam to said cutter head, said cam formed with a threaded neck portion, a fingered plate mounted on said neck portion with freedom for rotary and longitudinal movement with respect to the shaft, a second fingered plate fixed on said shaft against relative longitudinal movement and with freedom for relative rotary movement, toggles connected to said fingered plates, means for actuating said toggles to raise and lower said first mentioned fingered plate and said cam on said shaft to move said radially movable plates and means on said burner support for engagement with said fingers to prevent rotation of said fingered plates.

8. An apparatus for making round gas burners comprising a burner support, a cutter head,

a. shaft fixed to said cutter head, a fixed cutter comprising a cutter head, a shaft fixed to said 5 cutter head, a cutter fixed to said head, a radially movable plate having an upwardly and inwardly inclined extension mounted on said cutter head, a first cutter on said movable plate, a

second cutter superimposed on said first cutter,

said second cutter overlapping the first cutter and being of less thickness than said first cutter, and the cutting edge of said first cutter extending at right angles to and into contact with the under face of the second cutter to insure removal 3 of burs formed by said first and second cutters, a cam member slidable upon said shaft having an inclined slot into which said extension extends and locks said cam to said cutter head, and means for raising and lowering said cam to move said radial plate.

10. An apparatus for making round gas burners comprising a burner support, a cutter head, a shaft fixed to said cutter head, means for rotating said shaft, a plurality of fixed cutter supports and cutters therefor symmetrically mounted on said cutter head about said shaft, radially movable plates having upwardly and inwardly inclined extensions mounted on said cutter head, a plurality of cutters on each of said radially movable plates, a cam member slidable on said shaft having inclined slots into which said extensions extend and lock said cam to said cutter head, said cam formed with a threaded neck portion, a plate mounted on said neck portion with freedom for rotary and longitudinal movement with respect to the shaft, a second plate fixed on said shaft against relative longitudinal movement and with freedom for relative rotary movement, toggles connected to said plates, means for actuating said toggles to raise and lower said first mentioned fingered plates and said cam on said shaft to move said radially movable plates.

CHRISTOPHER L. HARDWICK. 

